As a user from 2006, fx ux has worsened considerably. If I could get a chrome which syncs (but not to Google) I'd switch.
They are trying things they shouldn't and not doing well on things they should be. I will never understand the dumb decision to make address bar row single line long from two lines earlier. It's basic ux! Just because chrome does it doesn't make it right
Why shouldn't it? If I spent 10 months coming up with non trivial interface and 10 years marketing and popularizing it, you cant come in one day and steal the thunder